Extensions for iOS development classes

Source: Internet
Author: User

Class Extension Common methods: Define subclasses, follow protocols, use classifications, source file extensions.

Source file Expansion: syntax: adding before declaring @implementation

@interface Class name ()

....

@end

Category categories

Adding a subclass when adding a method to an existing class is inconvenient

Classification is an extension of an existing class, the classification extends only the method, the property is not extended

Protocol Protoccol

Can be used to declare a whole bunch of methods

As long as a class follows this protocol, it is equivalent to having all the method declarations in this Protocol

Extensions for iOS development classes

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